Burglar alarm



l. F. MACKOVITCH.

BURGLAR ALARM.

APPLICATION FILED 050.17. |921.

1,42 1,972, Patented July 4, 1922.

2 SHEETS-SHEET I.

J. F. MACKOVITCH. 1

BURGLAR ALARM.

APPLICATION FILED DEC. 17. 1921.

1,421,972, Patented July 4, 1922. A

2 SHEETS-SHEET 2.

FIG. 3.

.and

T @Lip Fi @E Josemi r.' Mnoxoviroa'orooivwn, rnivivsYLvANIA. AssIGivoR or' QNELTHIRD 'ro "iv/mNnaLInii MAILING, or PITTSBURGH, PENNSYLVANIA.

'inea-ara.

-Spe'cication' o'fLetters Patent.

Patented duly 4, 1922.

Application filed-December 17,1921.V kSerial No. 523,047'.

To all whom 'it may concern.'

Be .it known that l, id'osnrH F. Macnevrroi-na citizen ofJugo-Slavia, residing at Conway, vinthe county of Beaver and State of Pennsylvania, have invented certain new useful Improvements in Burglar Alarms, of which the following is a specification. l

T his invention relates to certain new and useful improvements .in Aburglar alarms of that type Aembodying audible means for warninga person of tlieattemp'tfofa person to effect .a clandestine entrance to his home.

The primary object of kthe invention is to provide vmeans of afspring'motor driven type for effecting the successful firing of cartridges upon .an .unauthorized attempt to open a door or the like.

Another object of the invention Kis to provide means for releasing .a motor actuated alarm of a novel construction whereby the samemay lbe released by an authorized person before opening a door or window though inaccessible to an unauthorized yperson.

Still another object of the invention is to generally simplify Vand improve devices of the above kind.

lVith the .above general objects in view and others that will appear as the nature of the invention is better understood, .the same consists of the novel form, combination and arrangement of .parts hereinafter vmore fully described, shown in the accompanying drawings and claimed.

In the drawings, wherein 4like reference characters designate .corresponding parts throughout the several views, Y

Figure 1 is a 'fragmentary elevational view showing a Asliding door and iframe equipped with a burglar alarm in accordance with -tlie present invention,

Figure 2 is a .transverse vertical sectional view of the alarm mechanism per se drawn on a larger scale,

Figure 3 is a longitudinal vertical sectional view of the device .shown in Fig. 2,

Figure 4 is a fragmentary sectional view taken substantially upon line IV-IV of Fig. '3, i

Figure 5 is a vertical sectional view taken substantially upon line V-Vof Fig. 3 with parts omitted,

Figure 6 is a 4horizontal sectional view takensubstantially upon line VI-VI of Fig, 1 ind'showing the-alarm release device Spartly in vtop -plan and ,partly in horizontal section,

'Figure 7 risl an elevational View of the .alarm release device, .and

Figure 8 is a .perspective view of the releasingcam for the swinging member of the invention .preferably embodies a rectangular .casing '5 adapted to be secured at -any convenient or preferred point -such as upon Vthe 4frame 6 `of a slidingjdoor 7 asshown in tFigQ1, said casing rihajving a spring motor 8 suitably Ymounted therein including a Vhoused coilspringadapted to drive a transverse power shaft 9 Vhaving'spur gears 10 and 11 .fixed thereon. A suitable vertical bearing .12 is secured to one side wallof the casing 5 and has a short winding shaft 13 journaled therein, said shaft 13 being provided `with a squaredlowerend 14terminating within the casing in line with van opening V1 5 in Vthe bottom wall of the casing through which va winding key 16 may be inserted yfor engagement with the end 14. A gear wheel 17 is secured upon the upper end of the-shaft 13 in mesh with the gear l0 so that the spring of the motor 8 mav be wound upon rotating the key 16 in thi?J proper direction, unwinding of said spring being prevented in any usual or preferred manner as by means of a ratchet mechanism diagiammatically shown and illustrated at 1S. f

, Another transverse vsha-ft 19 is journaled in the casing above the shaft 9 and has a bevel .gear 2O Vand a spur gear 21 secured upon one end thereof with -thespur gear 21 meshing with fthe gear 111. An upper corner ofthe casing `is divided by suitable partitions Yinto a Vfiring chamber 22 having arevolver cylinder 23 .suitably journaled vtherein, androne lof said `ipartitions has a hammer 24 Ihinged thereto iso .that Yits kfiring .pin 25 is -in .proper iposition to engage the 4priming cap .of the adjacent bullet or 'cartridge of the cylinder 23, said hammer 24 4being normally :projected `toward the cylinder by means of a relatively strong spring 26. The hammer 24 is provided with an arm 27 which extends downwardly below the pivot of the hammer and inwardly to the interior of the chamber 22 where it has its lower end pivotally'attached to the lower end of a push rod 28 which is suitably guided for vertical movement in the chamber 22 at the inner side of the cylinder 23. The rod 28 is provided with a spring pressed pawl 29 disposed to engage the ratchet teeth 30 provided in the usual way upon a cylindrical projection rigid with the central portion of the inner face of the cylinder 23.

As shown in Fig. 2 the gearing 21 is provided with one or more laterally projecting pins 31 while the upper end of the hammer 24 is provided with a lateral angular pin 32 arranged in the path .of said pins 31 so that kupon rotation of the gear 21 in the proper direction the hammer is caused to be swung away from the cylinder and then released so as to cause the firing pin 25 to strike the priming cap of the cartridge under the action of the spring 26.

The motor 8 may be operatively geared by means of a spur pinion 33 to another transverse shaft 34 which carries the pinion 33 and an escapement wheel 35, for sounding an alarm through the action of the escapement lever 36 and pivoted hammer 37 Which is connected to the escapement lever by means of a link 38 and which is extended through the adjacent wall of the casing 5 in a position to strike a suitable sound producing shell 39. The shafts upon which the escapement lever 36 and hammer 37 are respectively pivoted are indicated at 40 and 41 and may be secured at one end to the adjacent side wall of the casing and supported near the other end by a bracket 42.

A shaft 43 is suitably journaled longitudinally of the casing in a bracket 44 above the motor 8 and has a bevel pinion 45 fixed upon its inner end normally meshing with the bevel gear 20. As shown in Fig. 4 the shaft 43 is hollow and rotatably and slidably mounted upon a stationary spindle 46 which has its outer end fastened as at 47 in the end wall of the casing 5 opposite that adjacent which the chamber 22 is formed, a coil compression spring 48 being positioned between the outer end ofthe shaft 43 and the vadjacent wall of the casing so as to normally project the shaft 43 and gear 45 inwardly with the latter meshing with the gear 20. A drum including a separate flange disk 49, a hub 50 and a flange 51 integral with the hub is mounted upon the outer end of the shaft 43 with the flange disk 49 freely revoluble upon the shaft 43 and having transverse openings through which pins 52 slidably project, saidv pins 52 being provided with heads upon their inner ends to limit the inward movement of the disk 49 and being fixed in a circular series to the adjacent wall of the casing concentric with and about the shaft 46. The hub 50 and its flange 51 as well as an adjacent ratchet wheel 53 are fastened to the shaft 43 by means of a. key 54 or the like7 and a pin 55 extends through and is fixed transversely in the shaft 46 so as to have its opposite ends project through registered and opposite oblique slots in the shaft 43 and hub 50, one of which slotsis shown at 56 in F ig. 3. It will thus be seen that when the drum is r0- tated in one direction the same is caused to move endwise outwardly so as to compress the spring 48 and to cause the shaft 43 and pinion 45 to move therewith so that the pinion 45 is disengaged from the gear 20. This permits the motor 8 to drive the gear 20 and the gear 21 for the actuation of the hammer 24 and the hammer 37. Rotation of the shaft 43 and the gear 45 by means of the geair 20 is normally prevented by means of a pawl 57 engaging the ratchet wheel 53Y so that the gear 45 must be released from the gear 2O to permit the device to operate. In order to reset the mechanism the pawl 57 must'be manually released and the spring `48 will then immediately return the gear 45 into mesh with the gear 20. Access to the pawl 57 may be had through the hinged cover 58 of the casing. Means is provided for rotating the drum to release the pinion 45 from the gear 2O upon opening of the door 7 and t-he same includes a flexible cord or cable 59 attached to and partially wound upon the drum in the proper direction, said flexible member 59 passing from the drum outwardly through a side wall of the casing and then downwardly to an alarm release device generally denoted by the numeral 60 and clearly shown in Figs. 1 and 6 to 8 inclusive.

As shown, the alarm release device comprises a rod 61 slidably mounted in a casing 62 suitably secured to the frame 6 and having its outer end attached to the flexible member 59 while the inner end of the rod 6] is notched as at 63. The rod 61 may be slidably guided by means of screws or the like engaging a longitudinal slot 64 in the rod 61. Y

Another casing 65 is attached to the door 7 and has a catch 66 pivoted thereto as at 67 the free end of the catch 66 being provided with a lateral projection or being of hook shape as at 68 to engage the notch 63 so that when thedoor 7 is slid open a pull is exerted upon the rod 61 and flexible member 59. The catch 66 may be normally swung inwardly by means of a tension spring69 for engaging the notch 63 andra double cam disk 70 is pivoted within the casing 65 beneath the catch 66 for-releasing the latter. This cam disk may be limited in its rotary movement by means of screws or the like extending lthrough arcuate slots 7lin the narrow lportion of the disk adapted to be engaged yby screws or the like fastened to the casing 65 and door 7 andthe central portion ofthe disk A7() is Iprovided with a key hole asat .72 .registering with a similar vkey hole 73 inthe door 7 so that a wind key `may be inserted to .engage the shoulders .74 of the disk so as to .rotate the latter for releasing .the catch 66 :from theoutside. ThusVt-he alarm .release device comprises a separable connector, one member of lwhich .is attached vto fthe door and the other member of which .isattached to the door frame, and one of -said members being -key .actuated for release ofthe same from the exterior of vthe dwelling whereby an authorized person may enter the said dwelling without causing ithe ialarm .to be placed into operation.

In operation, it will be seen Ythat the catch 66 may be disengaged from thefbar 6l by rotation ofthe cam disk 70 so'that an authorized person may enter :through `the door upon opening the door without exerting apull upon the barland flexible ymember 59. However, should an unauthorized person succeed in unlocking the door 7 with the parts disposed as in Fig. l and Figs. 7 and 8, so that the door will cause a pull to be exerted upon `the Vbar 6l and flexible member 59 thereby causing a partial rotation of the head and flange 50 and.5l respectively together with the ratchet wheel 53' and through the medium ofthe pin 55 and slots 56, the drum and Vparts connected therewith vwill be given an outward endwise movement against the action of the spring 48 so .as to releaseI the pinion 45 from the gear 20 and thereby -allow :the motor 8 to drive .the gear V21 which in its rotation, causes successful `actuation of the lhammer 24 through the medium lof the .pins 3l and 32. At each rocking movement .of the hammer 24, the rod 2S 1s raised so as to cause the pawl 29 to engage the ratchet teeth 31 and thereby rotate the cylinder 2l 'for successively bringing anew cartridge into position for engagement by the firing pin 25. At the same time, t-he hammer 37 is actuated through the escapement mechanism for sounding the bell 39.

The chamber 22 may be provided with a metallic shell 75 to prevent flames from passing outwardly of the casing while providing a passage for the report or sound as each' bullet is fired, but as the specific construction of the same is not a part of the present invention, it is only shown in a general way.

From the foregoing description it is believed that the construction and operation as well as the advantages of the present invention will be readily understood and appreciated by those skilled in the art.

Minor changes may be made without departing from the spirit and scope of the invention as claimed.

,What is claimed as new is:--

il. In ra .burglar alarm of vthe class described, a rotatable cartridge. holding cylinder, a pivoted hammer .having a firing pin .for impacting the priming caps of the cartridges vin said cylinder', means operable upon :the swinging of said hammer for rotating the cylinder step by step `forbringing successive cartridges in the rpath of said firing pin, a rotatable member disposed adjacent the hammer and having Vlateral pins projecting from one face thereof toward the hammer, a motor to rotate said rotatable member, a pin fixed to and extending from the upper Aend ofthe handle in the path of said first named pins yfor retracting the hammer from the cylinder, and automatically releasing the same as the rotatable member is rotated, means to control the operation -ofsaid motor, and a spring normally urging the hammer toward the cylinder.

2. In a burglar alarm of the class described, a sound producing means including a rotatable gear and a spring motor operatively geared thereto, a stationary spindle, a rotatable shaft journaled upon said spindle and having a. pinion fixed upon one end thereof, yieldable means for normally causing endwise movement of said shaft and pinion to engage the latter with the gear, means associated with said shaft for preventing rotation of the same in one direction as influenced by said motor, and means operable upon rot-ation of the shaft in the op posite direction Afor causing endwise movement of the same together with its pinions against the action of said yieldable means so as to release the pinion from the gear and permit rotation of the gear by means of said motor.

In a burglar alarm of the class described, a sound producing means including a rotatable Vgear and a spring motor operatively geared thereto, a stationary spindle, a rotatable shaft journaled upon said spindle and having a pinion fixed upon one end thereof, yieldable means for normally causing endwise movement of said shaft and pinion to engage the latter with the gear, means associated with said shaft for preventing rotation of the same in one direction as influenced by said motor, means operable upon rotation of the shaft in the opposite direction for causing endwise movement of the same together with its pinions against the action of said yieldable means so as to release the pinion from the gear and permit rotation of the gear by means of said motor, said last named means including an oblique slot in said shaft, and a fixed radial pin engaging said slot.

llO

4. An alarm mechanism of the class described Vcomprising a spring motor, a gear driven thereby, a pivot hammer having a firing pin, a spring for urging the hammer to firing position, means including cooperating pins upon the hammer and gear for intermittently swinging the hammer from firing position as the gear is rotated, a second gear rotatable with the first named gear, a stationary spindle, a hollow shaft journaled upon and slidable longitudinally on said spindle, a pinion fixed upon one end of the hollow shaft, a spring normally urging the hollow shaft in one direction to engage the pinionl with said second named gear, means to cause endwise movement of the'hollow shaft upon rotation of the same in one direction to disengage the pinion from the second named gear, and ratchet means for preventing rotation of the hollow shaft in the opposite direction to which it is urged .by said motor.

5. An alarm mechanism of the class described comprising a spring motor, a gear driven thereby, apivot hammer having afiring pin, a spring for urging the hammer to firing position, means including cooperating pins upon the hammer and gear for intermittently swinging the hammerI from firing position as the gear is rotated, a second gear rotatable with the first named gear, a stationary spindle, a hollow shaft journaled upon and slidable longitudinally on said spindle, a pinion fixed upon one end of the hollow shaft, a spring normally urging the hollow shaft in one direction to engage the pinion with said second named gear, means to cause endwise movement of the hollow shaft upon rotation of the same in one direction to disengage the pinion from the second named gear, ratchet means for preventing rotation of the hollow shaft in the oppow site direction to which it is urged by said motor, means to rotate said hollow shaft including a flexible member, means for causing endwise movement of the hollow shaft including a drum to which the flexible member is attached and which is provided with an oblique elongated slot, said drum being fixed upon the hollow shaft, and Ya radial pin being fixed upon thel spindle and projecting into said slot. Y

6. As an actuating means for an alarm release pull cord, a'separable connector for attachment to a slidable closure and its frame and including a slidable bar having a guiding means adapted to be attached to said frame ,and to the pull cord, said bar having a notch operable from the outside of the closure for swinging the pivoted member so as to disengage its hooked end from said notch.

7. As an actuating means for an alarm release pull cord, a separable connector for at-v tachment to a slidable closure and its frame and including a slidable bar having a guiding means adapted to be attached to said frame and to the pull cord, said bar having a notch in its inner end, a pivot member having a hooked end yieldingly engaged in said notch and having a casing adapted to be secured to the slidable closure, and key operated means operable from the outside of the closure for swinging the pivoted member so as to disengage its hooked end from said notch, said last named means including a rotatable disk having a pair of opposite cam devices upon one side thereof` and arranged within the casing between the pivoted member and its casing.

8. As a means for actuating the pull cord of an alarm release mechanism, a separable connector including a pair of members respectively adapted for attachment to a slidable closure and its frame interiorly of a dwelling, said members being constructed for interlocking engagement, yieldable means to normally hold said members interlocked, and key operated means operable from the exterior of the dwelling for disconnecting said members.

In testimony whereof I afiix my signature.

JOSEPH r. Mackovicn. 

